Driving belt



May2,1 939.

E. SIEGLiNG DRIVING BELT 3 Sheets-Sheet 1 Filed Nov. 16, 1957 E.SIEGLING May 2, 1939.

DRIVING BELT Filed Nov. 16, 1937 v 3 Sheets-Sheet 2 fig. 10

d 62 M1 A 0 E AJ- 70 $1. WW4

7220622 for:

fi .5 Z i 3 y 1939. E. SIEGLENG 2,157,061

DRIVING BELT Filed NOV. 16, 1937 3 Sheets-Sheet 3 Inventor.- .S 1 5 1, nvf,

Patented May 2, 1939 PATENT OFFICE nnivmc BELT Ernst Siegling, Hanover,Germany Application November 16, 1937, Serial No. 174,843 In GermanyApril 30,, 1937 2 Claims.

So called fiat driving belts are known having an undivided cross-sectionprovided with projecting wedge-shaped ribs on the running side, and ofwhich the flat portion as well as the wedgeshaped portion participate inthe transfer of force.

The present invention is however exclusively concerned with .drivingbelts constituted by leather strips set on edge and connected togetherto form aiiat belt. According to the present invention the new featureconsists in that some of the leather strips are higher than theremaining greater portion of the strips which are of equal height, andthat these portions projecting beyond the lower edge of the running sideof the belt are arranged to run in grooves of a pulley.

These higher portions may according to one constructional form of thepresent invention be made of rectangular cross-section and running withplay in the grooves of the pulleys in which case they do not transferforce.

According to another aspect of the invention, the projecting strips maybe made of wedgeshaped cross-section so that in a manner known portionof the belt.

Further according to the invention the strips engaging or simplyprojecting into the grooves of the pulleys may be constituted incrosswise direction, of a number of individual parallel strips. Furtherit is possible to make the projecting portions andthe belt itself eachof a different material in accordance with the required action.

On the drawings a number of constructional forms of the newstrip-on-edgebelt are'illushated, the Figures 1 to 16 showing cross-sections ofvarious forms of-strip-Dn-edge belts comprising parts projectingtherefrom. Figures 17 to 19 40 and 21 to 23 show respectively sideelevations of various such strip-on-edge belts, Figure being a planview.

In all the illustrations the strips set on edge constituting the belt,are designated with a, d are the rivets or the like by means of whichthe strips a are held together in a known manner.

From the cross-sectional illustrations of Figures 1 to 16 it will beseen that members forming unilateral or bilateral projections b areinserted in the strip-on-edge belt a, these members serving to engageinto grooves of a cooperating pulley c.

For example Figure l showsa strip-on-edge belt formed of two leatherstrips a between which a strip b consisting of leather for example, isinin itself they transmit force as well as the upper I serted whichengages in the form of a wedge into the wedged groove of the pulley 0.

Figure 2 shows a multiple arrangement of such wedge-shaped projections bengaging into the groove of thepulley, the connections between thestrips being assured by means of the rivets d.

In the constructional example according to Figure 3 the member binserted between the leather strips a of the strip-on-edge belt isformed of a number of layers of leather or other suitable material kepttogether with the strip-on-edge belt a by means of rivets d.

The projection b is here of a rounded shape, in' accordance with thegroove provided in the pulley c.

jections according to Figure 3.

The Figures 5 and 6 show in singleand multiple arrangement respectivelyprojections b of an angular cross-section which in thiscase only act asguiding members, the strip-on-edge belt lying in contact with the pulleyc, in contradistinction to the constructional forms ofFigures l to 4,

structional form the longitudinal grooves in therim of the pulley arewider than the guiding ribs of the transmission means.

The transmission of power is efiected through adhesive friction of therunning surface of the strip-on-edge belt, and as shown in Figure 6,when the guiding is. eifected in such any exact manner by the ribs b, itis possible for the width of the pulley to be utilised completely ornearly completely.

Figures 7 and 8 show in cross-section strip-onedge belt at havingbilateral Wedge-shaped projections b engaging into Wedge grooves of thepulley c. A strip-on-edge belt of this type is suitable for reversingdrives. I

In Figures 9 and 9a further constructional forms are shown forillustrating the fact that the individual strips of the strip-on-edgebelt a. may be made also from a material other than leather. For exampleinterwoven square ropes or layers 1 of fabric interconnected by means ofcaoutchouc, gutta-percha or the like may be employed. The

. 1 Figure 4 shows a multiple arrangement of proso as to act as afriction member. In this con strip-on-edge belt acts asa tractive/memberin range of the strip-on-edge belt by the rivets d. The wedge-shapedprojection may be specially held together by means of adhesive isaccording to Figure 10, by riveting 1 according to Figure 11 or by arivet m, e. g. from Vulcan fibre according to Figure 12.

' In the constructional form according to Figure 13 the projection b isformed by two side or jaw straps n enclosing a central filler o of asuitable material. This filler may be constituted'by natural orartificial caoutchouc or other suitable and more or less resilientartificial material.

Figure 14 shows in cross-section a further constructional example in,which the projection b is constituted by a number of layers having acoat of leather or fabric securing the connection of the said layers.

The projection b according to Figure 15 shows likewise a number oflayers which are held together by a countersunk rivet q. The layers mayalternately be made of difi'erent material. For example, layers ofleather may alternate with layers made of fabric and caoutchouc or thelike.

The constructional form according to Figure 16 shows inserted in thestrip-on-edge belt a a uniform body'forming a projection b andconstituted for example of fabric and caoutchouc or a material similarto caoutchouc. Within the projection b a core 1' of a suitable materialmay however. be embedded which is adapted to increase the resistance totear or the .resilient qualities of the projection b.

Figures 17 to 19 show side elevations of the strip-on-edge belt fromwhich it may be seen that the projections b are made with incisions Iall of which according to Figures 17 and 19, or some of which (Figure18) extend into.the strip-onedge belt a.

The plan view (from below) represented in Figure 20 illustrates thelongitudinal shape of these incisions.

From Figure 23 it may be seen that the individual projections b supporton one another when the belt runs through a curved path.

Figure 21 shows the incisionsreplaced by crosswise extending holeslzwhich, as is shown in Figure 22, may be replaced by slots decreasing inI clear width. The incisions f or the holes h may be all located in theprojections only.

If, for the incisions g or the holes h as far as they go through thestrip-on-edge belt'a, a crossholes 71. are arranged in staggeredrelation withv respect to the rivet holes, the cross-section of thestrip-on-edge belt is at no place weakened more than it is anyhow by thehole for the rivet shaft, so that in practice no weakening of thecross-section is effected by the provision of the incisions or holes.

It is further possible, as shown in Figure 19, to provide incisions i atthe outer surface of the strip-on-edge belt. In all cases the incisionor notch should only penetrate to such an extent that no greaterweakening is effected of the straps of the strip-on-edge belt than thatalready caused by the holes for receiving the cross-connecting means.

Although a number of constructional forms of the invention has beendescribed hereinbefore, it should be understood that the invention isnot restricted to the constructional forms shown the features of whichmay be combined in various diflerent manners within the scope of thepresent invention.

Having now described my invention, what claim as new and desire tosecure by Letters Pat'- ent is:

1. A belt drive for use with two pulleys arranged at a distance from oneanother and each provided at its circumference with at least onewedge-shaped annular groove, said driving belt adapted to co-operatewith said pulleys and being composed of, -stri'ps set on edge side byside and connected together, the greater portion of the being composedof strips set on edge side by side connected together, the greaterportion of the number of these strips being equal in height and at leastone strip having greater height than re-' maining strips and havingwedge-shapedcross section in its projecting portion and being.subdivided by incisions extending throughout the height of theprojecting portion, and which are of small dimension in the longitudinaldirection of the belt, whereby when the belt runs over a pulley theadjacent surfaces of the higher strip contact one another; said drivingbelt being arranged that'the higher strip is adapted to engage into theannular groove of the pulleys.

' ERNST SIEG LING.

